what is function scoped variables (var) and block scoped variables in es6?

Question

I am new to javascipt as I have started learning js now, I am pretty confused with var that is said to be function scoped and block scoped;

If so then how do we access them outside of that function!? lets say i want to use it from another class (I don't know maybe by creating some object or whatever) (I guess we can't create objects here! because as it is a functional programming based language I guess!:( )

var y = "global";

if (y === "global") {
  var y = "block-scoped";
  console.log(y); // expected output: block-scoped
}

console.log(y); // expected output: block-scoped

Answer 1

var is not said to be function scoped.

Variables declared with var can either be function or Global scoped.

• If the declaration occurs within a function, then the variable is scoped to that function.
• If the declaration occurs outside of a function, then the variable is scoped Globally.

If a variable is declared with let or const, then it has block level scope. A block is delimited by {} or if those symbols are not present, the enclosing function or, if not in a block or a function, then Global.

I've written another post that discusses scope and the scope chain in much greater detail and should help in answering your coding scenario.